Senator John D. Rockefeller (D-WV) sent a letter requesting that the Federal Trade Commission assess the use of facial recognition technology and recommend legislation to protect privacy. Facial recognition technology is being used by technology firms and also police agencies, which has raised civil liberties concerns. The letter cited mobile applications such as SceneTap, which "tracks the male/female ratio and age mix of the crowd [in bars]" and digital advertising at the Venetian Resort in Las Vegas that tailors ads to the person standing in front of the display based on recognition of that person’s age and gender. The FTC will hold a workshop on facial recognition technology on December 8, 2011. EPIC's complaint regarding Facebook's facial recognition is still pending before the FTC. For more information, see EPIC: In re Facebook, and EPIC: Facial Recognition.